<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
           
        </el-breadcrumb>

        <el-card>
            <el-alert
                title="注意：只允许为第三级分类设置相关参数"
                type="warning" show-icon :closable="false">
            </el-alert>

            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <el-cascader
                    v-model="value"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!--tab页签区域-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!--添加动态参数的面板-->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!--动态参数表格-->
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <el-tag closable v-for="(item,i) in scope.row.attr_vals" @close="handleClose(i,scope.row)" :key="i">{{item}}</el-tag>
                                 <!--输入的文本框-->
                        <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                        >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>

                       

                                                <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteDialog(scope.row.attr_id)">删除</el-button>
                                
                        </template>
                        </el-table-column>
                        
                    </el-table>

                </el-tab-pane>
                <!--添加静态属性的面板-->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!--静态参数表格-->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <el-tag closable v-for="(item,i) in scope.row.attr_vals" @close="handleClose(i,scope.row)" :key="i">{{item}}</el-tag>
                                 <!--输入的文本框-->
                        <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                        >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>

                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteDialog(scope.row.attr_id)">删除</el-button>
                                
                        </template>
                        </el-table-column>
                        
                    </el-table>
                </el-tab-pane>
               

                
            </el-tabs>
        </el-card>

        <!--添加参数的对话框-->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

         <!--修改参数的对话框-->
         <el-dialog
         :title="'修改'+titleText"
         :visible.sync="editDialogVisible"
         width="50%" @close="editDialogClosed">
         <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
             <el-form-item :label="titleText" prop="attr_name">
               <el-input v-model="editForm.attr_name"></el-input>
             </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
             <el-button @click="editDialogVisible = false">取 消</el-button>
             <el-button type="primary" @click="editParams">确 定</el-button>
         </span>
         </el-dialog>
    </div>
</template>

<script>
    export default{
        data(){
            return {
                catelist:[],
                //级联选择框的配置对象
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                //级联选择框双向绑定到的数组
                value:[],
                //被激活的页签的名称
                activeName:"many",
                //动态参数的数据
                manyTableData:[],
                //静态参数的数据
                onlyTableData:[],
                addDialogVisible:false,
                addForm:{
                    attr_name:''
                },
                addFormRules:{
                    attr_name:[
                        {required:true,message:'请输入参数名称',trigger:"blur"}
                    ]
                },
                editDialogVisible:false,
                editForm:{},
                editFormRules:{
                attr_name:[
                        {required:true,message:'请输入参数名称',trigger:"blur"}
                    
                ]
                },
                inputVisible:false,
                //文本框中输入的内容
                inputValue:''
            }
         
        },
        created(){
            this.getCateList()
        },
        methods:{
            async getCateList(){
                const {data:res} = await this.$http.get('categories')
                if(res.meta.status !== 200){
                    return this.$message.error('获取数据失败')
                }
                this.catelist = res.data

            },
             //级联选择框选中项的变化，会触发这个函数
            handleChange(){
                this.getParamsData()

            },
            //tab的点击事件
            handleTabClick(){
                this.getParamsData()
            },
            //获取参数的列表数据
            async getParamsData(){
                if (this.value.length !== 3){
                    this.value = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return 
                }
               
                //根据所选分类的id和当前所处的面板，获取参数
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:this.activeName}
                })

                if (res.meta.status !== 200){
                    this.$message.error('获取参数失败')
                }
                
                console.log('---',res.data)


                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []

                    //控制文本框的显示和隐藏
                    item.inputVisible = false

                    //文本框中输入的值
                    item.inputValue = ''
                })
                console.log(res.data)
                if(this.activeName === 'many'){
                    this.manyTableData = res.data
                }else{
                    this.onlyTableData = res.data
                }
            },
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            addParams(){
                this.$refs.addFormRef.validate(async valid => {
                    if(!valid) return 
                    const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                        attr_name:this.addForm.attr_name,
                        attr_sel:this.activeName
                    })

                    if(res.meta.status !== 201){
                        return this.$message.error('添加属性失败')
                    }
                    this.getParamsData()
                    this.addDialogVisible = false
                })
            },
            async showEditDialog(attr_id){
                //查询当前参数的结果
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                    params:{attr_sel:this.activeName}
                })

                if(res.meta.status !== 200){
                    return this.$message.error('获取参数失败')
                }

                this.editForm = res.data
                this.editDialogVisible = true
            },
            editDialogClosed(){
                this.$refs.editFormRef.resetFields()
            },
            editParams(){
                this.$refs.editFormRef.validate(async valid => {
                    if(!valid) return 
                    const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    })

                    if(res.meta.status !== 200){
                        return this.$message.error('更新参数失败')
                    }

                    this.$message.success('修改参数成功!')
                    this.getParamsData()
                    this.editDialogVisible = false
                })
            },
            async deleteDialog(attrId){
                const confirmResult = await this.$confirm('此操作将永久删除该操作,是否继续', '提示', {
                confirmButtonText: '确定',
                cancelButtonText:'取消',
                type:'warning'
            }).catch(err => err)
            
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除')
            }

            //删除的业务逻辑
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
            if(res.meta.status !== 200){
                return this.$message.error('删除参数失败!')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
            },
            async handleInputConfirm(row){
                if(row.inputValue.trim().length === 0){
                    row.inputValue = ''
                    row.inputVisible = false
                    return 
                }
                //没有return 则输入内容
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false

                this.saveAttrVals(row)
            },
            showInput(row){
                //当改变布尔值的时候，页面还是原来的页面，还未被重新渲染
                row.inputVisible = true
                //$nextTick 方法的用，当页面上的元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
        });
            },
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            },
            //将对attr_vals的操作，保存到数据库
            async saveAttrVals(row) {
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                })

                if(res.meta.status !== 200){
                    this.$message.error('更新参数失败')
                }

                this.$message.success('修改参数成功!')
            }
        },
        computed:{
            isBtnDisabled(){
                if(this.value.length !== 3){
                    return true
                }
                return false
            },
            cateId(){
                if(this.value.length === 3){
                    return this.value[2]
                }
                return null
            },
            titleText(){
                if(this.activeName === 'many'){
                    return '动态参数'
                }else{
                    return '静态属性'
                }
            }
        }
       
       
        
    }

</script>

<style lang="less" scoped>
    .cat_opt{
        margin:15px 0px;
    }

    .el-tag{
        margin:10px
    }

    .input-new-tag{
        width:120px
    }
</style>